US composer's endless ambition to produce close harmony (10)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

[Samuel] BARBER’S HOP[e]; and here’s Barber’s setting of James Agee’s poem ‘Sure on this shining night’ https://www.youtube.com/watch?v=T8rd_mJ_bE0&ab_channel=TolosaChoralContest. James Agee’s film criticism is worth looking up. He was a master of the art.